Claw
1.7.0
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00001 /* 00002 CLAW - a C++ Library Absolutely Wonderful 00003 00004 CLAW is a free library without any particular aim but being useful to 00005 anyone. 00006 00007 Copyright (C) 2005-2011 Julien Jorge 00008 00009 This library is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU Lesser General Public 00011 License as published by the Free Software Foundation; either 00012 version 2.1 of the License, or (at your option) any later version. 00013 00014 This library is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public 00020 License along with this library; if not, write to the Free Software 00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 00023 contact: julien.jorge@gamned.org 00024 */ 00031 /*----------------------------------------------------------------------------*/ 00035 template<class T> 00036 claw::math::line_2d<T>::line_2d() 00037 { 00038 00039 } // line_2d::line_2d() [constructor] 00040 00041 /*----------------------------------------------------------------------------*/ 00046 template<class T> 00047 template<class U> 00048 claw::math::line_2d<T>::line_2d( const line_2d<U>& that ) 00049 : origin(that.origin), direction(that.direction) 00050 { 00051 00052 } // line_2d::line_2d() [copy constructor] 00053 00054 /*----------------------------------------------------------------------------*/ 00060 template<class T> 00061 claw::math::line_2d<T>::line_2d 00062 ( const point_type& _origin, const direction_type& _direction ) 00063 : origin(_origin), direction(_direction) 00064 { 00065 00066 } // line_2d::line_2d() [constructor with values] 00067 00068 /*----------------------------------------------------------------------------*/ 00076 template<class T> 00077 claw::math::line_2d<T>::line_2d( const value_type& ox, const value_type& oy, 00078 const value_type& dx, const value_type& dy ) 00079 : origin(ox, oy), direction(dx, dy) 00080 { 00081 00082 } // line_2d::line_2d() [constructor with detailed origin & direction] 00083 00084 /*----------------------------------------------------------------------------*/ 00089 template<class T> 00090 bool claw::math::line_2d<T>::parallel( const self_type& that ) const 00091 { 00092 return !( (direction.x * that.direction.y) 00093 - (that.direction.x * direction.y) ); 00094 } // line_2d::parallel() 00095 00096 /*----------------------------------------------------------------------------*/ 00101 template<class T> 00102 bool claw::math::line_2d<T>::orthogonal( const self_type& that ) const 00103 { 00104 return !( direction.dot_product( that.direction ) ); 00105 } // line_2d::orthogonal() 00106 00107 /*----------------------------------------------------------------------------*/ 00113 template<class T> 00114 typename claw::math::line_2d<T>::point_type 00115 claw::math::line_2d<T>::intersection( const self_type& that ) const 00116 { 00117 point_type result; 00118 00119 if ( ! parallel( that ) ) 00120 { 00121 point_type delta( that.origin - origin ); 00122 value_type n, m; 00123 00124 n = direction.x * delta.y - direction.y * delta.x; 00125 m = that.direction.x * direction.y - direction.x * that.direction.y; 00126 00127 result.x = that.origin.x + (n * that.direction.x) / m; 00128 result.y = that.origin.y + (n * that.direction.y) / m; 00129 } 00130 00131 return result; 00132 } // line_2d::intersection() 00133 00134 /*----------------------------------------------------------------------------*/ 00139 template<class T> 00140 typename claw::math::line_2d<T>::value_type 00141 claw::math::line_2d<T>::y_value( const value_type& x ) const 00142 { 00143 return (direction.y * (x - origin.x) + direction.x * origin.y) / direction.x; 00144 } // line_2d::y_value()